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US6299830B2 - Apparatus and method for tapping a furnace - Google Patents

Apparatus and method for tapping a furnace Download PDF

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Publication number
US6299830B2
US6299830B2 US09/159,280 US15928098A US6299830B2 US 6299830 B2 US6299830 B2 US 6299830B2 US 15928098 A US15928098 A US 15928098A US 6299830 B2 US6299830 B2 US 6299830B2
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United States
Prior art keywords
rod
insert
molten
molten material
passageway
Prior art date
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Expired - Lifetime
Application number
US09/159,280
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English (en)
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US20010007382A1 (en
Inventor
Brian D. Raivo
Gary V. Buss
Mitchell R. Greenhalgh
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MeltTran Inc
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MeltTran Inc
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Filing date
Publication date
Application filed by MeltTran Inc filed Critical MeltTran Inc
Priority to US09/159,280 priority Critical patent/US6299830B2/en
Assigned to MELTTRAN, INC. reassignment MELTTRAN, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BUSS, GARY V., GREENHALGH, MITCHELL R., RAIVO, BRIAN D.
Priority to PCT/US1999/022022 priority patent/WO2000017590A1/fr
Publication of US20010007382A1 publication Critical patent/US20010007382A1/en
Application granted granted Critical
Publication of US6299830B2 publication Critical patent/US6299830B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D3/15—Tapping equipment; Equipment for removing or retaining slag
    • F27D3/1509—Tapping equipment
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • C21C5/38—Removal of waste gases or dust
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • C21C5/42—Constructional features of converters
    • C21C5/44—Refractory linings
    • C21C5/445—Lining or repairing the taphole
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/52—Manufacture of steel in electric furnaces
    • C21C5/5205—Manufacture of steel in electric furnaces in a plasma heated furnace
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B3/00—Hearth-type furnaces, e.g. of reverberatory type; Electric arc furnaces ; Tank furnaces
    • F27B3/10—Details, accessories or equipment, e.g. dust-collectors, specially adapted for hearth-type furnaces
    • F27B3/19—Arrangements of devices for discharging
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D3/12—Travelling or movable supports or containers for the charge
    • F27D2003/125—Charging cars, lift trolleys
    • F27D2003/127—Charging cars, lift trolleys for carrying pots
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D99/00—Subject matter not provided for in other groups of this subclass
    • F27D2099/0085—Accessories
    • F27D2099/0093—Means to collect ashes or dust, e.g. vessels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D3/15—Tapping equipment; Equipment for removing or retaining slag
    • F27D3/1509—Tapping equipment
    • F27D3/1536—Devices for plugging tap holes, e.g. plugs stoppers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D9/00—Cooling of furnaces or of charges therein
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

Definitions

  • the present invention relates to the tapping of molten metal furnaces, and more particularly, to the removal of molten basaltic type slags and metals from high temperature plasma arc furnaces and the confinement of fumes generated during the removal.
  • High temperature plasma arc melters are traditionally utilized for the production of irons and steels and for other extractive metallurgy purposes. Recent developments in the usage of plasma arc melters for the processing of minerals and waste material have generated a need for improved methods of removing molten basalt from the primary melting chamber.
  • Basaltic slags and reduced metals are produced from waste type arc furnaces at temperatures nominally in the range of 1500° C. to 2000° C.
  • Basaltic slag are generally viscous in nature even at high temperatures and are very corrosive. The viscous nature of these slags presents difficulties in removal of the product from the melter.
  • One standard method to aid in the removal is to add fluxing agents such as alkali metals Na, K etc.) or alkali earth metals (Ca, Mg, etc.) to chemically change the composition and reduce the viscosity for a given temperature range.
  • fluxing agents such as alkali metals Na, K etc.
  • Another method used is raising the temperature of the melt a sufficient amount to ensure a flowable liquid as the liquid progresses through an opening in the melter (removal means). Alternately, heat may be added to the removal means to ensure a flowable liquid stream.
  • the temperature of the melt must be sufficient to provide a flowable fluid through the product removal means (taphole or weir) to remove a generally viscous product.
  • Basaltic slags generally remain viscous above 1535° C. (melting point of iron) and are very corrosive and acidic. The acidic nature of these slags often precludes the use of standard components generally used in the iron and steel industry which are commonly available.
  • Electrically fired plasma torches are currently used for the processing of minerals and waste material. These torches tend to operate in the 5,000° C. to 10,000° C. range at the torch with bath temperatures approaching greater than 2500° C. in the hot areas.
  • Graphite electrode plasma arc furnaces may be operated in very short arc or submerged orientations and tend to operate at slightly lower bath temperatures in the range of 1500° C. to 2000° C. Operations with higher bath temperatures provide the ability for greater control of viscosity, but result in energy and maintenance penalties. Operations with a bath temperature just high enough to encourage chemical reactions and the production of basaltic type material provide economic and maintenance advantages but complicate the removal of the basaltic slag product.
  • Molten material is generally removed from the furnaces by tipping the furnace and pouring the material over a spout, by opening a tap hole located in the side or bottom of the funiace, or by flowing the material under and over weir structures located at the bottom of the furnace.
  • Eccentric bottom tapping is generally standard practice for tapping electric arc furnaces used in the production of steel.
  • Molten material is generally removed from blast furnaces by drilling out a plug of material located in a hole through a sidewall in the furnace.
  • the molten material is removed in a batch operation in which nearly all of the molten material is drained from the furnace once the hole is tapped.
  • this method provides a relatively simple and inexpensive method for product removal.
  • the hole is generally closed with a disposable plug, ram gun, ramming paste or mixture, or other type of mechanical closures. These closures are often difficult to install and remove and may be susceptible to leaks.
  • the present invention involves a method and apparatus for removing molten materials from high temperature furnaces and the confinement of flames generated during the removal.
  • the invention provides controlled opening and closing of a tap hole in the furnace and allows for repeated starting and stopping of a molten stream.
  • An apparatus of the present invention is used for controlling the flow of molten material from a melt container having a tap hole formed in a sidewall of the container.
  • the apparatus generally comprises a tubular insert sized for insertion into the tap hole, a rod receivable within the insert and a cooling device for cooling the rod to a temperature below the temperature of the molten material.
  • the insert has a first end for insertion into the molten material, a second end, and a fluid passageway extending between the first and second ends.
  • the rod is longitudinally movable between a first position wherein the rod is positioned within the tubular insert for cooling a portion of the molten material through the passageway, and a second position wherein the rod is spaced from the first end of the insert to allow the plug to melt and start the flow of molten material through the passageway.
  • the rod is formed of copper and the cooling device comprises a passageway extending along at least a portion of the rod for flowing fluid within the rod.
  • the high thermal conductivity of the copper draws heat away from the molten material to a cooling medium.
  • the continuous cooling of the copper pin by a heat transfer fluid and a heat sink causes the plug to remain intact during the high temperature melting process.
  • the geometry of the rod and insert and penetration of the cooled rod into the insert are important factors in the formation of the plug and a button (body) of solidified material within the higher temperature molten bath.
  • the removal of the rod with subsequent stoppage of cooling of the plug and button within the insert causes the solidified button to heat up and melt back into the molten bath. This causes an initiation of a molten basalt tap stream through the insert.
  • a tapping system of the present invention generally comprises a melt container for melting a material, a tapping mechanism operable to start and stop flow from the container, a housing interposed between the tapping mechanism and melt container, and a conduit having a first end connected to the housing and a second end connected to an upper chamber of the melt container.
  • the system further comprises a vacuum source connected to the upper chamber of the melt container to draw off gases generated during the melting and tapping processes from the container and housing.
  • a method of controlling flow of molten material from a container comprises inserting a rod into the tubular insert, cooling the rod below the temperature of the molten material, and forming a solid plug from molten material at a first end of the rod assembly by cooling a portion of the molten material, thereby stopping the flow of molten material through the tubular insert in the container.
  • the method employed utilizes a chilled copper insertion rod to cool and solidify a plug of basalt within the insert.
  • a method of molding an object from a high alumina-chrome plastic refractory comprises: filling a mold with the material; applying pressure to the mold; relieving pressure from the mold; heating the mold to solidify the object; removing the material from the mold; and heating the material.
  • the mold is preferably heated at 200° F. for approximately 24 hours and the material is subsequently cured after removal from the mold to 1600° C.
  • FIG. 1 a is a cross-sectional view of a melt crucible, tap chamber, and tapping mechanism of the present invention.
  • FIG. 1 b is a cross-sectional partial view of the tap chamber and melt crucible of FIG. 1 .
  • FIG. 2 is an enlarged side view of a taphole insert assembly positioned within the melt crucible of FIG. 1 and a formed basalt plug and solidified button.
  • FIG. 3 is a flow diagram of a process for forming the taphole insert of FIG. 2 .
  • FIG. 4 is a cross-sectional view of an assembled taphole mold used in forming the taphole insert of FIG. 1 b.
  • FIG. 5 a is a schematic of a tapping system of the present invention.
  • FIG. 5 b is an enlarged view showing the interface between the tap chamber and a tap canister.
  • the tapping apparatus comprises a tapping mechanism 12 and a tapping chamber 7 configured for engagement with a melt crucible (container) 1 .
  • the tapping apparatus controls the flow of molten material such as molten basaltic type slag from high temperature plasma arc furnaces and confines fumes generated during the removal.
  • FIG. 1 a shows a cross-sectional view of the melt crucible 1 and tapping mechanism 24 .
  • the melt crucible 1 is lined with an insulating refractory 2 and a working refractory 3 , and contains a molten basalt layer 5 and molten metal layer 6 .
  • the insulating refractory 2 is made from a standard high alumina material commonly used in insulating refractories.
  • the working refractory 3 is made from a plastic refractory material having a high alumina-chrome refractory (such as RUBY® plastic available from Indresco, Inc. of Pittsburgh, Pa.) in a brick, plastic, or ram form.
  • the high alumina content gives high temperature resistance and the chrome provides corrosion resistance.
  • This high alumina-chrome plastic refractory material is commonly used in working refractories.
  • the crucible has a taphole formed in a sidewall thereof for receiving a tubular taphole insert 4 .
  • the insert 4 is preferably cemented to the working refractory 3 and insulating refractory 2 .
  • the tapping chamber 7 is interposed between the tapping mechanism 12 and crucible 1 and includes a first opening 7 a for fluid communication with the crucible, a second opening 7 b for receiving a tapping rod 17 from the tapping mechanism 12 , and a third opening 7 c for delivering the molten material.
  • the insert 4 is received within the first opening 7 a of the chamber 7 .
  • a bushing 9 forms a passageway extending from the first opening 7 a to the second opening 7 b of the chamber 7 .
  • the chamber 7 is sealingly attached to the sidewall of the crucible 1 at the location of the taphole.
  • a locating flange 8 a extends around the periphery of the taphole and includes a groove 8 d for receiving a rib 8 c protruding from the tapping chamber 7 at the location of the first opening 7 a (FIGS. 1 a and 1 b ).
  • a compressible seal 8 b is preferably disposed within the groove 8 d to prevent the escape of gas from between the mating surfaces of the chamber 7 and crucible 1 .
  • Quick disconnect over-center toggle clamps (not shown) are used to draw the chamber 7 towards the crucible 1 and sealingly engage the chamber to the crucible. It is to be understood that other types of clamps, flanges, or seal configurations may be used without departing from the scope of the invention.
  • the chamber 7 further includes a sample port 7 d in the chamber sidewall, an access port 10 at the top of the chamber for mounting a camera to monitor tapping operations and a vacuum port 11 on a sidewall of the tapping chamber for connection of a vacuum duct 33 , as described below.
  • the tapping mechanism 12 includes a cylindrical housing 12 a which is connected to the tapping chamber 7 opposite the location of the crucible 1 .
  • the housing 12 a is preferably bolted to the chamber 7 .
  • a bushing 9 extends from the second opening 7 b in the chamber 7 into a similarly sized opening in one end of the housing 12 a .
  • a drum 14 is disposed within the housing 12 a and rotatably mounted on a shaft 13 .
  • the rotating drum 14 includes axial bearing tubes 15 located equidistant from the center shaft 13 .
  • the bearing tubes 15 are aligned axially with the bushing 9 and the taphole insert 4 by indexing the drum 14 into position via a ring gear 16 located on the drum exterior and an indexing motor/gear arrangement 16 a.
  • the tapping mechanism further includes a tapping rod 17 which is axially driven through the tapping chamber 7 and into the taphole insert 4 .
  • the rod 17 is preferably driven by a pneumatic cylinder 17 a having an operating pressure of 150 psi.
  • the air cylinder 17 a preferably has a stroke of 20 inches and is controlled by an electrically actuated solenoid control valve 17 b , although the invention is not limited to a particular stroke length.
  • the tapping rod 17 is longitudinally movable between a first position wherein the rod is positioned within the insert 4 for cooling a portion of the molten material located at a first end of the insert to form a plug 19 and stop the flow of molten material, and a second position wherein the rod is spaced from the insert to allow the plug to melt and start the flow of molten material (FIGS. 1 a and 2 ).
  • a cooling device conducts heat away from the molten material surrounding the rod within the taphole insert 4 to a heat transfer fluid 18 .
  • the fluid may be water, thermal oil, or any other suitable cooling fluid.
  • the cooling device includes a passageway formed within the rod to circulate fluid 18 through the rod and a heat sink (not shown).
  • the conduction of heat from the molten basalt within the taphole insert 4 causes the molten basalt (or metal) to solidify within the taphole insert forming a plug 19 around the tapered end of the tapping rod 17 .
  • the penetration of the tapping rod 17 to the inside surface of the taphole insert 4 and the conduction of heat through the pin causes the molten basalt in that region to solidify and form a solid button 20 on the inside surfaces of refractory and taphole insert nearest the molten bath.
  • the continuous cooling of the rod 17 by the passing of a heat transfer fluid 18 through the tubing to a heat sink causes the basalt plug 19 and the basalt button 20 to remain intact during high temperature melting processes.
  • the tapping rod 17 is made from copper.
  • the tapping rod 17 may be formed from other metals or alloys which allow conduction of heat away from the molten material 5 and to the heat transfer fluid 18 .
  • Other metals include, but are not limited to, aluminum, tungsten, titanium, or stainless steel.
  • the taphole insert 4 is formed from plastic refractory having the same, or similar, material composition as the working refractory 3 . This allows the taphole insert 4 to be resistive of the highly corrosive molten material.
  • the geometry of the tapping rod 17 and the taphole insert 4 are important parameters for the successful operation of starting and stopping the flow of molten material from the melt crucible 1 .
  • the tapping rod 17 preferably has a diameter of 2.5 in. and has an end 26 which is tapered to a 1.1 inch diameter at an angle of between 2 and 5 degrees, for example. While this embodiment of the tapping rod end 26 has a flat end, alternate embodiments could have a tapping rod end with a different shape, such as rounded, for example.
  • the taphole insert 4 consists of a converging-diverging double taper in its interior.
  • the taphole insert 4 has a 19-20° taper from the outside, or tapping machine outer housing 12 side, converging to a 2.0 inch diameter orifice within the taphole insert 4 and then a 1.5-3.5° diverging taper on the interior side, or melt crucible 1 side, of the taphole insert.
  • the taphole insert has a 19.5° taper from the outside and a 2.5° diverging taper on the interior side, for example. It is to be understood that the rod 17 and insert 4 may have different shapes or sizes than the configuration shown herein without departing from the scope of the invention.
  • the rod end 26 may be inserted further into the melt 5 and past the interior wall of the refractory 3 by slightly altering the geometry of the insert 4 and rod 17 to allow the formation of a thinner button 20 for faster melt of the button, and initiation of a tap stream.
  • the rod end 26 extends into the melt 5 a distance approximately equal to or less than the rod end 26 diameter to allow for repeated starting and stopping of the tap stream.
  • the tapping rod 17 is equipped on its end with an impacting device 23 to impart a shock force through the tapping rod to the basalt plug interface bond. Energizing the impactor 23 during the withdrawal sequence assures that the bond is broken and the tapping rod 17 is unrestrained for removal.
  • the rotating drum 14 may be rotated about axis A and indexed to a second tool position wherein a stinger pin 22 may be utilized as an alternate means to quickly penetrate a high viscosity melt plug within the taphole insert 4 and aid in the initiation of a tap stream.
  • Additional axial tubes may be located on the rotating drum 14 to allow the addition of auxiliary tools and other diagnostic devices.
  • the removal of the tapping rod 17 from the taphole insert 4 with the subsequent stoppage of cooling of the basalt plug 19 and button 20 within the taphole insert 4 causes the solidified basalt button 20 to heat up from the internal heat of the molten bath and melt back into the basalt layer 5 .
  • This causes an opening to the exterior and the initiation of a molten basalt tap stream through the tap insert 4 and into a tapping chamber 7 .
  • the stream exits the tap insert 4 into the tap chamber 7 horizontally and bends to vertical due to gravity, thereby exiting the tap chamber vertically downward through a melt exit port 7 c .
  • the tap chamber 7 is filly enclosed on the lateral and vertically upward surfaces.
  • a tap canister may be docked and sealed to the melt exit port 7 c of the tap chamber 7 to complete the enclosure.
  • FIG. 3 is flow chart illustrating a preferred process of forming a taphole insert from a high alumina-chrome plastic refractory material.
  • FIGS. 4 shows a mold 200 for use in forming the taphole insert 4 shown in FIGS. 1 a and 2 .
  • the mold comprises a mold body 202 , bottom 204 , center pin 206 , and top 208 .
  • the taphole insert 4 is formed in the interior space 210 of the assembled mold 200 .
  • the procedure for forming the taphole insert is as follows. A mold free of particulate or other materials is sprayed on its interior molding surfaces with a high temperature stove paint at step 101 . If any particulate or plastic refractory material from a prior molding is on the molding surfaces, they should be removed prior to step 101 . The paint is allowed to dry fully. At step 102 a generous coat of oil (such as vegetable oil) is applied to all internal surfaces of the mold. The parts of the mold are then assembled at step 103 . The mold top 208 is mated to the mold center pin 206 with mating self-aligning surfaces and bolted together with the remaining mold 200 and are held together by aligning geometry. At step 104 the assembled mold is then placed in a standard press.
  • oil such as vegetable oil
  • the mold is then filled with a high alumina-chrome plastic refractory material at step 105 .
  • the filled mold is then pressed at step 106 until the body of the mold rebounds approximately ⁇ fraction (1/16 ) ⁇ inch.
  • aluminum foil is placed on the bottom of the mold 200 and the mold is then pressed again.
  • the press is released and the mold 200 is removed from the press.
  • the top 208 is removed and any material protruding from the top is trimmed with a knife or other such instrument, thus leaving the material in the mold 200 flush with the top of the mold.
  • the top 208 of the mold is replaced and the mold is placed in the press and pressed.
  • the press is held for approximately 15 minutes at about 3700-5700 lb f .
  • the press is released and the steps 109 and 110 of removing and trimming are repeated.
  • the top of the mold is replaced and the mold is placed in the press and pressed. The press is held again for approximately 15 minutes.
  • the press is released and the steps 109 and 110 of removing and trimming are repeated.
  • the mold 200 with the top 208 removed, is placed in an oven with the surface of the mold where the top was removed, facing up. The mold 200 is cooked in the oven at a temperature of 200° F. for approximately 24 hours.
  • the hot mold 200 is removed from the oven and placed in a press.
  • the center pin 206 is pressed out of the mold 200 while the mold is still hot.
  • the mold is flipped over and the taphole insert 4 is pressed out. This is done while the mold 200 is still hot.
  • the taphole insert 4 is placed in an oven and cured to 1600° C. This takes approximately 12 hours.
  • FIG. 5 a shows a tapping system of the present invention.
  • the melt crucible 1 is attached to a melt upper chamber 30 from which gases are drawn into an off gas cleansing system 31 via means of an induced draft fan 32 .
  • a vacuum duct (conduit) 33 is attached at the tap chamber vacuum port 11 to the melter upper chamber 30 at a port 34 .
  • the vacuum port 11 and duct 33 withdraw fugitive emissions from the chamber and transfer the emissions to negative pressure areas of the melt container 1 , thus enabling equalization of pressure in the tapping chamber to the melter pressure to aid in initialization of a molten tap stream.
  • the induced draft fan creates a slight vacuum, which is controlled in the range of ⁇ 0.5 to ⁇ 10 inches of water column within the melter internal assembly. This slight vacuum draws fugitive emissions into the off gas cleansing system prior to being exhausted from the induced draft fan.
  • An isolation valve 35 is disposed in the duct 33 to isolate the tapping chamber from the melter internals when necessary or desired.
  • a tapping chamber isolation valve 36 is affixed to the exit 7 c of the tapping chamber 7 .
  • This isolation valve 36 is actuated via an air cylinder 37 and controlled via an electric solenoid valve similar to the operation of the tapping rod 17 described above.
  • a canister docking seal flange 38 (FIG. 5 b ) is bolted to the isolation valve 36 to allow docking and undocking of a movable tap canister cart (holding tank) 39 .
  • the tap canister cart 39 is transportable horizontally via means of flanged track wheels 40 driven by an electric motor/gearbox 41 .
  • the canister is vertically raised and lowered via means of an electric motor leadscrew 42 .
  • the tap canister cart 39 has a heavy walled steel safety canister 43 affixed to the vertical drive 42 .
  • a flange section 44 which contains a compressible high temperature seal 45 .
  • the seal 45 is mated with the seal flange 38 at edge 46 for completion of a closed tapping system.
  • a removable and reusable safety canister 47 Within the heavy walled canister is a removable and reusable safety canister 47 and within the removable safety canister is a disposable tapping canister.
  • isolation valve 35 , tap chamber 7 , and tap canister 43 are placed under slight vacuum nearly equal to the melter vacuum. This slight vacuum withdraws any fumes or fugitive emissions occurring during the tapping process into the melt crucible upper chamber 30 for processing within the off gas cleansing system 31 .
  • the present invention provides a design for a method and apparatus for the controlled opening and closure of a taphole located in the side wall of a melt vessel which allows repeated starting and stopping of a molten stream.
  • the present invention has the advantage of allowing confinement and control of fugitive emissions.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Furnace Charging Or Discharging (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)
US09/159,280 1998-09-22 1998-09-22 Apparatus and method for tapping a furnace Expired - Lifetime US6299830B2 (en)

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US09/159,280 US6299830B2 (en) 1998-09-22 1998-09-22 Apparatus and method for tapping a furnace
PCT/US1999/022022 WO2000017590A1 (fr) 1998-09-22 1999-09-22 Appareil et procede de soutirage d'un fourneau

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US6299830B2 true US6299830B2 (en) 2001-10-09

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Cited By (7)

* Cited by examiner, † Cited by third party
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WO2004065871A1 (fr) * 2003-01-17 2004-08-05 Outokumpu Oyj Ensemble et procede permettant d'ouvrir et de fermer le trou de coulee d'un reacteur de fusion
US6799595B1 (en) 2003-03-06 2004-10-05 The United States Of America As Represented By The Secretary Of The Navy Meltable and reclosable drain plug for molten salt reactor
US20100261599A1 (en) * 2009-04-10 2010-10-14 Edw. C. Levy Co. Taphole Fill Material and Method for Manufacturing the Same
US9920995B2 (en) 2014-10-31 2018-03-20 Aldo Longo Sand dispensing system and method of dispensing sand into a metal making furnace
WO2020117181A1 (fr) * 2018-12-05 2020-06-11 Геннадий Иванович АЛЫМОВ Perforateur pour courvrir les trous de coulée de fours industriels
RU209428U1 (ru) * 2018-12-05 2022-03-16 Геннадий Иванович Алымов Перфоратор для вскрытия лёток индустриальных печей
US11338362B2 (en) * 2017-06-29 2022-05-24 Danieli & C. Officine Meccaniche S.P.A. Melting apparatus for the production of steel

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ATE406423T1 (de) 2004-07-05 2008-09-15 3M Innovative Properties Co Grundierung aus ptfe für metallsubstrate
US7683761B2 (en) * 2005-01-26 2010-03-23 Battelle Memorial Institute Method for autonomous establishment and utilization of an active-RF tag network
AU2010321669B2 (en) * 2009-11-18 2014-08-14 Glencore Technology Pty Limited Method for removing slag from a furnace
LU92330B1 (en) * 2013-12-09 2015-06-10 Tmt Tapping Measuring Technology Sarl Tap-hole refurbishing
EP3037558A1 (fr) 2014-12-22 2016-06-29 Refractory Intellectual Property GmbH & Co. KG Dispositif pour insérer un bloc réfractaire dans une structure de trou de coulée d'un récipient métallurgique, en particulier un four à oxygène basique et procédé pour une alimentation automatique du réfractaire

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FR566634A (fr) 1922-05-27 1924-02-18 Dispositif pour boucher le trou de coulée dans des fours de fusion
FR704745A (fr) 1929-11-04 1931-05-26 Ass Elect Ind Perfectionnements au mode de coulée des fours
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US4081178A (en) 1976-02-02 1978-03-28 Elkem-Spigerverket A/S Apparatus for collection of tapping gases from electric smelting furnaces
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US4335265A (en) 1980-12-16 1982-06-15 Gulf Canada Limited Robot tapping electrode for electric arc furnaces
US4336922A (en) 1979-06-08 1982-06-29 Gesellschaft Fur Huttenwerksanlagen Mbh Continuously tapped cupola furnace
US4341547A (en) 1979-07-10 1982-07-27 Deutsche Gesellschaft Fur Wiederaufarbeitung Apparatus for enclosing highly radioactive waste material in a glass melt
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DE3613894A1 (de) 1986-04-24 1987-10-29 Fuji Electric Co Ltd Giessofen der tiegelbauart und giessverfahren
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FR704745A (fr) 1929-11-04 1931-05-26 Ass Elect Ind Perfectionnements au mode de coulée des fours
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US4639927A (en) 1985-07-23 1987-01-27 Kabushiki Kaisha Takuma Continuous melt electric furnace with continuous discharge
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US4679773A (en) 1985-09-30 1987-07-14 Wunsche Edgar R Horizontal tapping furnace and method of operation
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US5271539A (en) 1986-06-09 1993-12-21 Kawasaki Steel Corporation Pressure type automatic pouring furnace for casting
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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004065871A1 (fr) * 2003-01-17 2004-08-05 Outokumpu Oyj Ensemble et procede permettant d'ouvrir et de fermer le trou de coulee d'un reacteur de fusion
US6799595B1 (en) 2003-03-06 2004-10-05 The United States Of America As Represented By The Secretary Of The Navy Meltable and reclosable drain plug for molten salt reactor
US20100261599A1 (en) * 2009-04-10 2010-10-14 Edw. C. Levy Co. Taphole Fill Material and Method for Manufacturing the Same
US8062577B2 (en) 2009-04-10 2011-11-22 Edw. C. Levy Co. Alumina taphole fill material and method for manufacturing
US8216954B2 (en) 2009-04-10 2012-07-10 Edw. C. Levy Co. Taphole fill material and method for manufacturing the same
US9920995B2 (en) 2014-10-31 2018-03-20 Aldo Longo Sand dispensing system and method of dispensing sand into a metal making furnace
US11338362B2 (en) * 2017-06-29 2022-05-24 Danieli & C. Officine Meccaniche S.P.A. Melting apparatus for the production of steel
WO2020117181A1 (fr) * 2018-12-05 2020-06-11 Геннадий Иванович АЛЫМОВ Perforateur pour courvrir les trous de coulée de fours industriels
RU209428U1 (ru) * 2018-12-05 2022-03-16 Геннадий Иванович Алымов Перфоратор для вскрытия лёток индустриальных печей

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